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Unformatted text preview: 3. For a particular stress tensor σ x = 9 MPa, σ y = 20 MPa and σ z = -20 MPa. If σ 1 = 3 and σ 2 = 2, what is the value of σ 3 ? ( σ 1 , σ 2, and σ 3 are principal normal stresses). (Ans: 4 MPa) 4. Explain why : (a) Studying stress analysis under the condition of 3-D is important. (b) Charpy impact test is a simple test for studying energy absorbed before facture. (c) The use of notched specimen in the charpy test. (d) Ductility is important (e) Knowledge about anisotropy is important 5. What is the difference between? (a) Strength and stress, (b) Tensor of the first rank and tensor of the second rank, (c) The proportional limit and the elastic limit, (d) the stress strain curve for a metal and that of a polymer, (e) Tensile strain and shear strain 2...
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This note was uploaded on 02/20/2012 for the course CBEMS 45B taught by Professor Shi during the Spring '12 term at UC Irvine.
- Spring '12